中南大学学报（自然科学版）2017，Vol.48Issue(9)：2520-2528,9.DOI:10.11817/j.issn.1672-7207.2017.09.034
流道弯曲对圆柱绕流尾迹流场的影响
Effect of pipe bends on evolution of circular cylinder wake
摘要
Abstract
To reveal the effects of pipe bends on the evolution of circular cylinder wake, two-dimensional flows passing a circular cylinder downstream of pipe which bends at low Reynolds numbers were simulated numerically. The effects of channel width, angle of bend and length of bend on the flow field were discussed. The effects of some groups of angle and length of bend on a certain channel width were obtained. The results show that the flow field of flow passes a circular cylinder downstream of pipe bends, which is the result of the interaction between the bend and the circular cylinder. The asymmetry of the flow field distribution is caused by the existence of the bending section. Channel width has significant impact on the characteristic parameters of the flow field. Narrower flow channel results in more complex flow fields. With the larger pressure difference before and after the cylinder, there is 1.4 times longer length of vortex and 3° larger of separation angle. Also, two circulation regions can be observed on the walls on either side of the wake. The pressure coefficient, average of drag coefficient and root-mean-square of lift coefficient all significantly increase with the increase of the bending angle, and reach the maximum when θ is 90°.With the increase of bending length, the influence of bending section on flow field is smaller.关键词
圆柱绕流/流道弯曲/尾迹演化/漩涡脱落/特征参数Key words
flow around circular cylinder/pipe bend/wake evolution/vortex shedding/characteristic parameters分类
能源科技引用本文复制引用
王丽燕,周天,孙志强,易丹青..流道弯曲对圆柱绕流尾迹流场的影响[J].中南大学学报（自然科学版）,2017,48(9):2520-2528,9.基金项目
国家自然科学基金资助项目(51576213) （51576213）
湖南省科技计划项目(2015RS4015) (Project(51576213) supported by the National Natural Science Foundation of China （2015RS4015）
Project(2015RS4015) supported by the Scientific Program of Hunan Province) （2015RS4015）
